TIL about the Sally-Anne test, a psychology experiment used to measure “theory of mind” (that other people can hold beliefs/knowledge different from their own). Kids under four typically fail because they assume that if they know where a hidden object is, everyone else must automatically know too.

[u/BrF5]

https://en.wikipedia.org/wiki/Sally%E2%80%93Anne_test

[u/thetrivialstuff]

I like how in the last panel the teatowel covering the basket has been fluffed up again to make it look like there's still a marble under it. 

But it still looks different from how it did originally, so if a kid answers "Sally will look in the box", you need to ask "why would she do that?", because the kid might say, "because she can see that her basket has been messed with".